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Fair Value Measurements - Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Fuel derivatives:    
Option contracts $ 538 $ 526
Fair Value, Measurements, Recurring    
Assets    
Treasury bills 2,029 2,226
Fuel derivatives:    
Interest rate derivatives (see Note 3) 23 14
Equity Securities 249 235
Total assets 12,520 13,053
Fair Value, Measurements, Recurring | Options Contracts    
Fuel derivatives:    
Option contracts 515 512
Fair Value, Measurements, Recurring | Commodity Option    
Liabilities    
Liabilities (28)  
Fair Value, Measurements, Recurring | Certificates of deposit    
Assets    
Investments 207 124
Fair Value, Measurements, Recurring | Time deposits    
Assets    
Investments   450
Fair Value, Measurements, Recurring | Cash Equivalents    
Assets    
Cash equivalents 9,166 9,040
Fair Value, Measurements, Recurring | Commercial paper    
Assets    
Cash equivalents 314 179
Fair Value, Measurements, Recurring | Certificates of deposit    
Assets    
Cash equivalents 17 23
Fair Value, Measurements, Recurring | Time deposits    
Assets    
Cash equivalents   250
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Treasury bills 2,029 2,226
Fuel derivatives:    
Interest rate derivatives (see Note 3) 0 0
Equity Securities 249 235
Total assets 11,444 11,501
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Options Contracts    
Fuel derivatives:    
Option contracts 0 0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Commodity Option    
Liabilities    
Liabilities 0  
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Certificates of deposit    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Time deposits    
Assets    
Investments   0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Cash Equivalents    
Assets    
Cash equivalents 9,166 9,040
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Commercial paper    
Assets    
Cash equivalents 0 0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Certificates of deposit    
Assets    
Cash equivalents 0 0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Time deposits    
Assets    
Cash equivalents   0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets    
Treasury bills 0 0
Fuel derivatives:    
Interest rate derivatives (see Note 3) 23 14
Equity Securities 0 0
Total assets 561 1,040
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Options Contracts    
Fuel derivatives:    
Option contracts 0 0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Commodity Option    
Liabilities    
Liabilities 0  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Certificates of deposit    
Assets    
Investments 207 124
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Time deposits    
Assets    
Investments   450
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Cash Equivalents    
Assets    
Cash equivalents 0 0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Commercial paper    
Assets    
Cash equivalents 314 179
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Certificates of deposit    
Assets    
Cash equivalents 17 23
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Time deposits    
Assets    
Cash equivalents   250
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Treasury bills 0 0
Fuel derivatives:    
Interest rate derivatives (see Note 3) 0 0
Equity Securities 0 0
Total assets 515 512
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Options Contracts    
Fuel derivatives:    
Option contracts 515 512
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Commodity Option    
Liabilities    
Liabilities (28)  
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Certificates of deposit    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Time deposits    
Assets    
Investments   0
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Cash Equivalents    
Assets    
Cash equivalents 0 0
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Commercial paper    
Assets    
Cash equivalents 0 0
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Certificates of deposit    
Assets    
Cash equivalents $ 0 0
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Time deposits    
Assets    
Cash equivalents   $ 0